This is a detailed discussion on the Hebrew calendar. It discusses Astronomy, Talmud, History, Josephus, Philo, Karaite views and more. It debunks many suppositions and makes a strong argument against the modern Hillel II calendar.

This is the second edition of this general treatise on the biblical calendar. It does not presuppose that the reader is already familiar with various aspects of the biblical calendar. It begins with the most basic matters and gradually fills in the details in an orderly fashion, never requiring the reader to know something that will be explained later except for some appendices.

HaHodesh Hazzeh Lakhem Rosh Hodashem - this month shall be unto you, the first of the months (Shemoth/Exodus ch.12, v.2). Hodesh HaAbib, the month of Nisan is the first month of the year in the counting of the months. No Viddui (confession) is recited during the entire month and there is no fasting.